Bag opening folding device for plastic packaging bag in packaging box

Abstract

The utility model discloses a packing case inner plastic package bag mouth furling device, which comprises a frame, a bag mouth stretching assembly and a bag mouth infolding assembly, the bag mouth stretching assembly and the bag mouth infolding assembly are arranged on the frame, a pair of bag mouth stretching parts of the bag mouth stretching assembly synchronously move upwards along the vertical direction from the descending position, each bag mouth stretching part drives the corresponding part of the bag mouth of the plastic package bag to ascend, and the plastic package bag is folded inwards. The lower end of a bag opening inner supporting part of the bag opening inner folding assembly is located in the bag opening of the plastic package bag; a pair of bag opening stretching parts of the bag opening inward folding assembly moves downwards in the vertical direction, a pair of bag opening folding parts sequentially move to the folding position from the initial position, the corresponding sides of the plastic package bags are pushed to enter the packaging box, and the bag opening folding device can be used for neatly and rapidly folding the bag openings of the plastic package bags in the packaging box. And the packing and packing efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of packaging technology, and in particular to a bag opening closing device for a plastic sealing bag inside a packaging box. Background Technology

[0002] In the production of various small daily necessities, in order to facilitate transportation, the products usually need to be boxed after they are manufactured. For example, tote bags have become a tool used in large quantities in modern society. After the manufacturers have made a batch of tote bags, they will neatly place multiple tote bags in the packaging box. The packaging box is lined with a plastic bag. The product is placed in the plastic bag to ensure the sealing of the product in the packaging box, so as to transport the product efficiently through the packaging box.

[0003] However, after the product is placed into the plastic bags inside the packaging box, the openings of the plastic bags are usually stacked at the opening of the packaging box. This means that when the packaging box is sealed later, manual sorting is required, which is extremely inefficient. In addition, when manually sorting the plastic bags inside the packaging box, the sorting shape of the plastic bags may be messy, causing complicated indentations on the products inside. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problem in the prior art that after the production items are packed into the plastic bags in the packaging box, the openings of the plastic bags are usually stacked at the opening of the packaging box, which requires manual sorting afterward, which is extremely inefficient. Moreover, when manually gathering the plastic bags in the packaging box, the shape of the gathered plastic bags may be messy, causing complicated indentations on the products inside.

[0005] To solve the above-mentioned technical problems, the present invention discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box, including a frame, a bag opening stretching component and a bag opening inward folding component disposed on the frame.

[0006] The bag opening stretching assembly includes a pair of bag opening stretching components spaced apart on both sides of the packaging box, and a bag opening lifting component that is pulsatorically connected to the pair of bag opening stretching components. The bag opening lifting component can move the pair of bag opening stretching components vertically between a lowering position and a rising position. In the lowering position, the pair of bag opening stretching components are located below the upper opening of the packaging box in the vertical direction, and their inner walls abut against the outer peripheral wall of the corresponding side of the packaging box. In the rising position, the pair of bag opening stretching components are located above the upper opening of the packaging box in the vertical direction and are opposite to each other.

[0007] Furthermore, the bag opening inward folding assembly is located above the packaging box, including a bag opening inward support component and a pair of bag opening folding components; wherein, the bag opening inward support component is located in the bag opening area of ​​the plastic-sealed bag inside the packaging box in the vertical direction, and the pair of bag opening folding components are located on opposite sides of the packaging box; and each bag opening folding component is drivenly connected to the corresponding inward folding drive component and moves between an initial position and a folding position that is at least partially extended into the packaging box.

[0008] A pair of bag opening stretching components move upwards vertically from their lowered positions, and each bag opening stretching component drives the corresponding part of the bag opening of the plastic seal bag to rise until the lower end of the bag opening support component is located inside the bag opening of the plastic seal bag; the pair of bag opening stretching components move downwards vertically, and a pair of bag opening folding components move sequentially from their initial positions to their folding positions, pushing the corresponding side of the plastic seal bag into the packaging box.

[0009] Using the above technical solution, this bag-closing device requires the inner-bag packaging box to be placed below the bag-closing folding component. At this point, the plastic-sealed bag inside the packaging box contains the product (e.g., neatly stacked tote bags), with the bag opening protruding from the opening of the packaging box. Next, a pair of bag-closing stretching components raise the corresponding part of the plastic-sealed bag opening until the lower end of the bag-closing support component is inside the bag opening. The bag-closing support component provides radial support to the bag opening within the bag opening area, ensuring a stable opening shape. Then, the pair of bag-closing stretching components retract to the lowered position, and the pair of bag-closing folding components sequentially push the two sides of the plastic-sealed bag opening into the box, forming a symmetrical and regular inward folding shape. At this point, the bag opening of the plastic-sealed bag is completely closed into the packaging box, without affecting the subsequent sealing of the packaging box, thus significantly improving the efficiency of packing. Furthermore, the folding mechanism of this type of plastic bag results in a neater opening, generally free of messy creases, which significantly reduces the risk of the plastic bag causing messy pressure marks on the product inside.

[0010] In addition, compared to manual bag-closing, this bag-closing device not only improves work efficiency but also reduces repetitive manual operations such as bending over and raising hands, thus reducing the labor intensity of workers.

[0011] The present invention also discloses a bag opening gathering device for a plastic seal bag inside a packaging box. When the bag opening folding component is in the initial position, the abutting end facing the plastic seal bag is located outside the corresponding side of the packaging box.

[0012] Furthermore, when the bag opening folding component is in the folded position, the abutting end extends into the packaging box and is located on the opposite side away from the corresponding side.

[0013] Using the above technical solution, the abutting end of the bag opening folding component needs to extend into the box and reach the opposite side area at the folding position, rather than just pushing the edge of the bag opening into the inside of the box. This design allows the corresponding side of the sealed bag opening to be completely pushed into the opposite space inside the packaging box, forming a deep inward fold across the width of the box. This avoids the problem of the bag opening only partially entering the box and still being partially stacked at the box opening, ensuring that no bag opening is exposed or hanging after the box is closed.

[0014] Furthermore, the abutting end of the bag opening folding component in the initial position is located outside the packaging box, ensuring that the folding component does not come into contact with the plastic bag or packaging box before the folding action is initiated, thereby avoiding the risk of accidental contact and displacement of the plastic bag or the packaging box below, which is already supported by the bag opening inner support component.

[0015] The present invention also discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box, wherein the frame has a mounting base located above the packaging box.

[0016] Among them, the inner support component of the bag opening extends downward from the mounting base and includes multiple bag opening opening members spaced apart along the circumference of the packaging box. When viewed vertically, the multiple bag opening opening members surround and form a bag-supporting space.

[0017] Furthermore, the mounting base is equipped with an internal support adjustment component, which can adjust the spacing between adjacent bag opening support components.

[0018] Using the above technical solution, multiple bag opening support components are arranged at intervals along the circumference of the packaging box, forming a bag-supporting space. This provides simultaneous radial support from multiple points around the bag opening, allowing the plastic-sealed bag opening to be expanded into a regular three-dimensional shape (such as square or rectangular) that matches the shape of the packaging box opening. Compared to single-sided or two-point support, which may lead to localized collapse or distortion, this type of internal bag opening support provides more stable support. Furthermore, each bag opening support component extends vertically, ensuring a large contact area with the protruding part of the plastic-sealed bag opening, thus providing more stable support and preventing the bag opening from shifting or wrinkling during folding due to insufficient support.

[0019] Furthermore, the internal support adjustment component allows for adjustment of the spacing between adjacent bag opening support components, enabling the circumferential dimensions (such as side length and diameter) of the bag support space to flexibly adapt to packaging boxes with different opening sizes and plastic bags of different specifications. Simultaneously, the spacing of the bag opening support components can be fine-tuned to control the tightness of the support on the plastic bag opening: for example, for thinner, more easily damaged plastic bags, the spacing can be appropriately reduced to decrease the support force; for thicker, more difficult-to-open plastic bags, the spacing can be appropriately increased to ensure support effectiveness. This controllable support method avoids the problem of excessive stretching and damage to the bag opening or insufficient support and collapse caused by mismatched dimensions of the fixed internal support components, improving the adaptability to plastic bags of different materials. Of course, when a pair of bag opening stretching components pull the corresponding part of the plastic bag opening to the lower outer side of the internal support component, the spacing between adjacent bag opening support components can also be appropriately increased through the internal support adjustment component to better support the bag opening.

[0020] The present invention also discloses a bag opening closing device for a plastic-sealed bag inside a packaging box. Multiple bag opening opening components include two pairs of support rods that are spaced apart along the circumference of the packaging box and extend in the vertical direction. The two pairs of support rods are arranged in opposite directions parallel to the two side walls of the packaging box.

[0021] Furthermore, the internal support adjustment component includes an adjustment drive motor mounted on the mounting base and a pair of adjustment drive belts connected to the adjustment drive motor. The adjustment drive belts of each adjustment drive belt group extend along the opposite directions of the two side walls of the packaging box. Each pair of support rods is fixedly connected to the corresponding adjustment drive belt. The adjustment drive motor synchronously drives a pair of adjustment drive belts and moves the two pairs of support rods toward or away from each other.

[0022] Using the above technical solution, two pairs of support rods are arranged in opposite directions along the side walls of the packaging box and extend parallel to the side walls, so that the outline of the bag support space is perfectly matched with the rectangular (or square) outline of the packaging box opening. This design can provide symmetrical and uniform radial support from the two sides of the bag opening. This design avoids excessive local stress or support blind spots at the bag opening caused by uneven support points, and ensures that the plastic seal bag opening is opened into a regular rectangular shape that matches the packaging box opening, further reducing the risk of bag opening wrinkles and product indentations.

[0023] Furthermore, the adjustment drive motor of the inner support adjustment component moves the two pairs of support rods in opposite directions or in the opposite direction through a pair of adjustment transmission belts. This allows the two pairs of support rods to be adjusted continuously and synchronously, rather than in a stepped or unilateral independent manner. This ensures that the bag space always maintains a symmetrical shape and avoids problems such as bag opening support offset and folding interference caused by unilateral adjustment.

[0024] The present invention also discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box, wherein a pair of bag opening folding parts are oscillating relative to each other on a mounting base.

[0025] Each bag opening folding component is a push plate. Each push plate is mounted on the mounting base and can swing relative to the other via a swing rod. The upper end of the swing rod is rotatably mounted on the mounting base, and the lower end is connected to the push plate via an angle adjustment component.

[0026] Each angle adjustment component includes a first connecting block and a second connecting block; wherein, one end of the first connecting block is hinged to the lower end of the swing rod, and the other end is rotatably connected to one end of the second connecting block, and the other end of the second connecting block is fixedly connected to the corresponding side of the push plate; wherein, the other end of the first connecting block and one end of the second connecting block are connected to each other through a protrusion and a sliding groove structure.

[0027] Furthermore, the upper ends of the two swing rods are rotatably mounted on a pair of rotating shafts, which extend side by side above the middle of the packaging box and along the opposite directions of the two side walls of the packaging box.

[0028] Using the above technical solution, the pusher plate can make surface contact with the corresponding part of the plastic seal bag. Compared with rod-type or claw-type folding components, the contact area with the bag opening is larger and the force is more uniform, which can effectively avoid bag opening damage or wrinkles caused by local stress concentration. Furthermore, the pusher plate is hinged to the rotation shaft of the mounting base through a swing rod. The folding action follows an arc-shaped trajectory. For example, when swinging from the initial position (outside the box) to the folding position (opposite side inside the box), the pusher plate first moves towards the box opening, then extends downward into the box, and finally pushes the bag opening to the opposite side. Compared with linear telescopic folding components, the arc-shaped movement trajectory of the pusher plate of this bag opening folding component can greatly avoid spatial interference with the internal support components of the bag opening. Moreover, the arc-shaped pushing trajectory allows the direction of the force exerted by the pusher plate on the bag opening to change gradually, smoothly transitioning from "lateral push" to "inward push", avoiding the instantaneous impact of linear push, and further reducing the risk of bag opening wrinkles and product indentations.

[0029] Furthermore, the push plate of the bag opening folding component is connected to the lower end of the swing rod through an angle adjustment component, which makes it easy to adjust the posture of the push plate relative to the swing rod, thereby avoiding interference between the push plate and the inner support component of the bag opening or the side wall of packaging boxes of different sizes during the folding process.

[0030] In addition, a pair of rotating shafts connected to the upper ends of the two swing rods are located above the middle of the packaging box. The swing rods can move the push plate from the initial position outside the packaging box to the folded position inside the packaging box with a large swing amplitude, thereby ensuring that the opening of the plastic bag can be completely closed inside the packaging box.

[0031] The present invention also discloses a bag opening closing device for a plastic-sealed bag inside a packaging box. When a pair of bag opening folding components are in their initial positions, the lower end of each swing rod is located outside one side of the packaging box, and the upper end extends obliquely upward toward the inner side of the packaging box to the upper side of the other side of the packaging box and is rotatably connected to the corresponding rotating shaft. Furthermore, the upper ends of the pair of swing rods are staggered on their respective rotating shafts.

[0032] Using the above technical solution, the upper end of the swing rod is connected to the rotating shaft located on the other side of the packaging box. When the swing rod swings around the corresponding rotating shaft from the initial position to the lowest point, the push plate extends into the packaging box and is located on the other side of the packaging box when viewed vertically. That is, the push plate at the lower end of the swing rod can continuously push the corresponding part of the plastic seal bag to the other side of the packaging box, ensuring that the corresponding part of the plastic seal bag opening can be folded into the packaging box, and ensuring that the opening of the plastic seal bag is folded into the packaging box.

[0033] The present invention also discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box. The frame is also provided with an inward folding lifting component. The mounting base is provided on the inward folding lifting component and can move synchronously with the inward folding lifting component in the vertical direction. The bag opening folding component in the folding position is pressed down into the top of the plastic-sealed bag inside the packaging box.

[0034] The inner folding lifting component includes an inner folding lifting drive, an inner folding transmission belt assembly connected to the inner folding lifting drive, and an inner folding lifting guide rail extending vertically. The mounting base is slidably mounted on the inner folding lifting guide rail, and one side is fixedly connected to one side of the inner folding transmission belt assembly. The inner folding lifting drive drives the inner folding transmission belt to move vertically, and the mounting base moves along the inner folding lifting guide rail in conjunction with it.

[0035] Using the above technical solution, when the bag opening folding component completes the folding action and is still in the folded position, the inner folding lifting drive component drives the inner folding transmission belt to move in the vertical direction, and drives the mounting base to move down along the inner folding lifting guide rail. This causes the bag opening folding component on the mounting base to press down on the plastic seal bag. Through continuous pressure, the folded bag opening is kept in a closed posture, eliminating the rebound gap and improving the tightness and stability of the bag opening. This avoids the problem of the folded edge curling up and the bag not closing tightly after the bag opening is folded due to the flexible rebound characteristics of the plastic seal bag material.

[0036] The present invention also discloses a bag opening gathering device for a plastic seal bag inside a packaging box. The bag opening folding assembly further includes a pair of side inserts located on opposite sides of the packaging box and offset from the pair of bag opening folding components in the circumference of the packaging box.

[0037] Furthermore, a pair of side insert components are connected to a side insert drive component on the mounting base. The side insert drive component can move the pair of side insert components toward each other and push against the corresponding part of the bag opening of the plastic bag surrounding the inner support component of the bag opening.

[0038] Using the above technical solution, before the inner support component supports the opening of the plastic seal bag and before the pair of opening folding components are activated, the pair of side insertion components are moved in opposite directions by the side insertion drive component, thereby pushing against the corresponding part of the opening of the plastic seal bag. This allows the opening of the plastic seal bag to be more reliably supported by the inner support component and forms a pre-folded area. Subsequently, when the opening folding component pushes the opening of the plastic seal bag to fold, it can neatly fold the opening of the plastic seal bag.

[0039] The present invention also discloses a bag opening gathering device for a plastic sealing bag inside a packaging box, wherein a pair of bag opening folding parts are located on both sides of a pair of front faces of the packaging box, and a pair of side insert parts are located on both sides of a pair of sides of the packaging box.

[0040] Furthermore, each side insertion component includes a side insertion plate, and a side insertion guide rail is provided on the mounting base. The side insertion plates of a pair of side insertion components are set on the side insertion guide rail. The side insertion drive component includes a side insertion drive motor set on the mounting base and a side insertion drive belt assembly that is connected to the side insertion drive motor. Each side insertion plate is fixedly connected to the side insertion drive belt of the side insertion drive belt assembly. The side insertion drive motor drives the side insertion drive belt, which in turn moves the side insertion plates of a pair of side insertion components toward each other or toward each other.

[0041] Using the above technical solution, the side insert plates of a pair of side insert components push against the corresponding parts of the plastic seal bag from both sides of a pair of sides of the packaging box. Then, a pair of bag opening folding components push the plastic seal bag inward from both sides of a pair of front sides of the packaging box, thereby neatly closing the bag opening of the plastic seal bag inside the packaging box. Furthermore, the bag opening of the plastic seal bag itself is completely closed, avoiding the problems of outward turning and loosening caused by the unrestrained part of the bag opening.

[0042] Furthermore, the side inserts are slidably mounted on the side insert guide rails of the mounting base, thereby providing guidance for the movement of a pair of side inserts. This ensures that the pair of side inserts can only move in opposite directions, without deflection, jamming, or positional shift. It also ensures that the side inserts can be accurately aligned with the bag opening on the side of the packaging box, and that the pushing force is evenly applied to the edge of the sealed bag opening.

[0043] The present invention also discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box. Each bag opening stretching component includes a mounting base plate connected to the upper end of the corresponding bag opening lifting component, and a pair of bag opening stretching members disposed on the mounting base plate.

[0044] Each bag opening stretching component includes a stretching drive motor and a bag opening stretching plate that is connected to the output end of the stretching drive motor. The bag opening stretching plate is provided with multiple air extraction holes that are respectively connected to the external air extraction equipment pipeline and are used to adsorb the corresponding part of the bag opening of the plastic seal bag.

[0045] Furthermore, the bag opening lifting component includes a bag opening lifting drive unit mounted on the frame, and a pair of bag opening lifting transmission belts connected to the bag opening lifting drive unit. Bag opening lifting guide rails extending vertically are respectively provided on the corresponding sides of the frame. The mounting base plate of each bag opening stretching component is slidably mounted on the corresponding bag opening lifting guide rail. The bag opening lifting drive unit drives the bag opening lifting belts of each bag opening lifting transmission belt group to move synchronously and link the pair of bag opening stretching components to move along the corresponding bag opening lifting guide rail between the lowering position and the rising position.

[0046] The packaging box with a plastic seal bag inside is located between a pair of bag opening stretching components. The stretching drive motor drives the pair of bag opening stretching plates to move synchronously toward the corresponding outer peripheral wall of the packaging box, and the inner wall abuts against the corresponding outer peripheral wall of the packaging box. The bag opening lifting drive component, in conjunction with the pair of bag opening stretching components, moves synchronously upward from the lower position to the raised position in the vertical direction. After the lower end of the bag opening inner support component is located inside the bag opening of the plastic seal bag, the bag opening lifting drive component, in conjunction with the pair of bag opening stretching components, lowers to the lower position.

[0047] Using the above technical solution, the bag opening stretching plate is equipped with multiple suction holes connected to an external suction device. It can use negative pressure to suction the corresponding part of the bag opening. When the stretching drive motor drives the stretching plate to abut against the outer wall of the packaging box, it can flexibly and evenly stretch and flatten the bag opening, avoiding the tearing and wrinkle accumulation problems caused by traditional mechanical grippers, ensuring a smooth and undamaged bag opening edge. Furthermore, when the bag opening lifting drive unit is linked by a belt assembly to a pair of stretching components rise synchronously, the bag opening stretching plate pulls the bag opening of the sealed bag up, where it is then held in place by the inner support component.

[0048] This utility model also discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box, wherein a pair of bag opening stretching plates are adjustablely spaced on a mounting base. Furthermore, the height of each bag opening stretching plate is adjustable at the output end of a stretching drive motor.

[0049] Using the above technical solution, the spacing between a pair of bag opening stretching plates is adjustable, which can adapt to the bag openings of plastic sealable bags of different widths. During operation, the spacing between the stretching plates can be adjusted according to the actual width of the bag opening, so that the pair of bag opening stretching plates can be precisely engaged with the two edges of the bag opening. This avoids problems such as unstable bag opening clamping and failure to close due to excessive spacing, or excessive compression deformation and damage to the bag opening edges due to insufficient spacing.

[0050] In actual operation, after the plastic-sealed bags are placed in the packaging box, the height of the bag opening may vary depending on the box depth and the amount of bag filling. At the same time, different packaging boxes also have different depth specifications. To address this, the height of each bag opening stretching plate at the output end of the stretching drive motor can be adjusted to accommodate plastic-sealed bags in packaging boxes of different depths and the bag opening positions of different heights.

[0051] The present invention also discloses a bag mouth gathering device for a plastic-sealed bag inside a packaging box. The frame is also provided with a transport component for transporting the packaging box. The bag mouth stretching component and the bag mouth inward folding component are arranged at the bag mouth gathering station on the transport path of the transport component. Furthermore, the transport path is also provided with a bag mouth pushing station, which is located downstream of the bag mouth gathering station on the transport path.

[0052] The bag opening pressing station is equipped with a bag opening pressing assembly, which includes a bag pressing drive unit mounted on the frame and a bag pressing plate that is connected to the output end of the bag pressing drive unit. The bag pressing plate is located above the opening of the packaging box being transported to the bag opening pressing station in the vertical direction. The two ends of the bag pressing plate in the transport direction are bent downward in the vertical direction to form a pair of guide parts. The bag pressing drive unit drives the bag pressing plate to move downward, pressing the bag opening of the plastic seal bag gathered in the packaging box, and the pair of guide parts are respectively inserted between the corresponding side of the plastic seal bag and the inner wall of the packaging box.

[0053] Using the above technical solution, multiple packaging boxes are sequentially transported through the bag-mouth closing station via a transport component. The bag-mouth stretching component and the bag-mouth inward folding component efficiently close the plastic-sealed bags inside each packaging box. Furthermore, a bag-mouth pushing station is located downstream of the bag-mouth closing station on the transport path. The bag-mouth pushing component shapes the initially closed bag mouth; that is, the bag-pressing drive component drives the bag-pressing plate downward to counteract the rebound stress of the bag mouth, ensuring that the bag mouth of the plastic-sealed bag remains stably closed. Additionally, the guide parts on both sides of the bag-pressing plate bend vertically downward, allowing them to be inserted into the gap between the plastic-sealed bag and the inner wall of the packaging box during the pressing process, thus limiting the side wall of the plastic-sealed bag and preventing lateral displacement of the bag mouth during compaction.

[0054] The present invention also discloses a bag opening gathering device for a plastic-sealed bag inside a packaging box. Both the bag opening gathering station and the bag opening pressing station are equipped with limiting components to limit the packaging boxes entering each station.

[0055] Using the above technical solution, during the process of transporting packaging boxes, positional deviations can easily occur due to factors such as conveyor belt slippage, differences in packaging box specifications, and material center of gravity shift. By setting limiting components at the bag opening gathering station and the bag opening pressing station, the packaging boxes entering the station can be positioned. For example, in the bag opening gathering station, it is ensured that the bag opening stretching component, inward folding component, and pressing component can accurately act on the target area of ​​the plastic seal bag opening, avoiding problems such as the bag opening stretching plate being misaligned or the inward folding not being in place due to packaging box deviation. In the bag opening pressing station, it is confirmed that the pressing plate can accurately press down the plastic seal bag gathered inside the packaging bag, greatly improving the success rate of bag opening gathering and pressing.

[0056] The beneficial effects of this utility model are as follows:

[0057] This utility model discloses a bag-closing device for a plastic-sealed bag inside a packaging box, including a frame, a bag-closing stretching component and a bag-closing inward folding component mounted on the frame. In use, the packaging box with the inner bag is placed below the bag-closing inward folding component. A pair of bag-closing stretching components raise the corresponding part of the plastic-sealed bag's opening until the lower end of the bag-closing inward folding component is inside the bag's opening. The bag-closing inward folding component provides radial support to the bag's opening within the opening area, ensuring a stable opening shape. Then, the pair of bag-closing stretching components retract to the lowered position, and a pair of bag-closing inward folding components sequentially push the two sides of the plastic-sealed bag's opening into the box, forming a symmetrical and regular inward fold. At this point, the bag's opening is completely closed inside the packaging box, without affecting the subsequent sealing of the box, thus significantly improving the efficiency of packing. Furthermore, the bag opening of the plastic-sealed bag folded by this bag-closing inward folding component is relatively regular, generally without messy wrinkles, reducing the likelihood of the plastic-sealed bag causing messy pressure marks on the internal product. In addition, compared to manual bag-closing, this bag-closing device not only improves work efficiency but also reduces repetitive manual operations such as bending over and raising hands, thus reducing the labor intensity of workers. Attached Figure Description

[0058] Figure 1 A three-dimensional structural schematic diagram of the bag opening closing device for the plastic sealing bag inside the packaging box provided in an embodiment of this utility model;

[0059] Figure 2 A three-dimensional structural diagram of the bag opening folding component of the bag opening gathering device for the plastic sealing bag inside the packaging box provided in an embodiment of this utility model;

[0060] Figure 3 A partial structural schematic diagram of the angle adjustment component of the bag opening gathering device for the plastic sealing bag inside the packaging box provided in this embodiment of the utility model;

[0061] Figure 4A three-dimensional structural schematic diagram of the bag opening inward folding component of the bag opening gathering device for the plastic sealing bag inside the packaging box provided in this embodiment of the utility model;

[0062] Figure 5 A three-dimensional structural diagram of the bag opening stretching component and the bag opening folding component of the bag opening gathering device for the plastic sealing bag inside the packaging box provided in this embodiment of the utility model;

[0063] Figure 6 A partial structural schematic diagram of the bag opening stretching component of the bag opening gathering device for the plastic sealing bag inside the packaging box provided in this embodiment of the utility model;

[0064] Figure 7 A three-dimensional structural schematic diagram of the bag opening pushing component of the bag opening gathering device for the plastic sealing bag inside the packaging box provided in this embodiment of the utility model;

[0065] Figure 8 A partial structural schematic diagram of the limiting component of the bag opening closing device for the plastic-sealed bag inside the packaging box provided in this embodiment of the utility model.

[0066] Explanation of reference numerals in the attached figures:

[0067] 10. Bag opening closing device;

[0068] 100. Frame; 101. Inner folding lifting guide rail; 102. Bag opening lifting guide rail;

[0069] 200. Bag opening stretch assembly;

[0070] 210. Bag opening stretching component; 211. Mounting base plate; 212. Bag opening stretching piece; 213. Stretching drive motor; 214. Bag opening stretching plate; 215. Air extraction hole;

[0071] 220. Bag opening lifting component; 221. Bag opening lifting drive component; 222. Bag opening lifting transmission belt assembly;

[0072] 300. Inward folding assembly for bag opening; 301. Mounting base; 302. Adjusting guide rail; 303. Rotating shaft; 304. Side insertion guide rail;

[0073] 310. Inner support component for bag opening; 311. Support rod; 312. Inner support adjustment component; 313. Adjustment drive motor; 314. Adjustment transmission belt assembly;

[0074] 320. Bag opening folding component; 321. Push plate; 322. Swing rod; 323. Folding drive component; 324. Angle adjustment component; 325. First connecting block; 326. Second connecting block;

[0075] 330. Side insertion component; 331. Side insertion plate; 332. Side insertion drive component; 333. Side insertion drive motor; 334. Side insertion transmission belt assembly;

[0076] 340. Inward folding lifting component; 341. Inward folding lifting drive component; 342. Inward folding transmission belt assembly;

[0077] 400. Transport components;

[0078] 500. Bag opening pushing assembly; 510. Bag pressing drive component; 520. Bag pressing plate; 521. Guide part;

[0079] 600. Limiting component; 610. Limiting drive component; 620. Limiting plate. Detailed Implementation

[0080] As mentioned in the background section, in the prior art, after the product is placed into the plastic bag inside the packaging box, the opening of the plastic bag is usually stacked at the opening of the packaging box, which means that manual sorting is required when sealing the packaging box later, which is extremely inefficient.

[0081] To address this, the present invention provides a bag opening closing device for a plastic-sealed bag inside a packaging box. The device includes a frame, a bag opening stretching assembly and a bag opening inward folding assembly mounted on the frame. A pair of bag opening stretching components of the bag opening stretching assembly move synchronously upwards vertically from a lowering position, each stretching component causing the corresponding part of the plastic-sealed bag opening to rise until the lower end of the bag opening inward folding assembly's inner support component is inside the plastic-sealed bag opening. The pair of bag opening stretching components of the inner folding assembly move downwards vertically, and a pair of bag opening folding components move sequentially from their initial positions to their folding positions, pushing the corresponding side of the plastic-sealed bag into the packaging box. This bag opening closing device can neatly and quickly close the plastic-sealed bag opening inside the packaging box, significantly improving the efficiency of packaging.

[0082] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0083] like Figure 1 As shown, this embodiment discloses a bag opening gathering device 10 for a plastic-sealed bag inside a packaging box, including a frame 100, a bag opening stretching assembly 200 disposed on the frame 100, and a bag opening inward folding assembly 300. It should be noted that the frame 100 is composed of multiple frame beams spliced ​​together. Figure 1 To facilitate the illustration of the structure of the bag opening stretching assembly 200 and the bag opening inward folding assembly 300, some structures of the frame 100 are not shown.

[0084] The bag opening stretching assembly 200 includes a pair of bag opening stretching components 210 spaced apart on both sides of the packaging box, and a bag opening lifting component 220 that is pulsatorically connected to the pair of bag opening stretching components 210. The bag opening lifting component 220 can move the pair of bag opening stretching components 210 vertically between a lowering position and a rising position. In the lowering position, the pair of bag opening stretching components 210 are located below the upper opening of the packaging box in the vertical direction, and their inner walls abut against the outer peripheral wall of the corresponding side of the packaging box. In the rising position, the pair of bag opening stretching components 210 are located above the upper opening of the packaging box in the vertical direction and are opposite to each other.

[0085] Furthermore, the bag opening inward folding assembly 300 is disposed above the packaging box, including a bag opening inward support component 310 and a pair of bag opening folding components 320; wherein, the bag opening inward support component 310 is located in the bag opening area of ​​the plastic-sealed bag inside the packaging box in the vertical direction, and the pair of bag opening folding components 320 are located on opposite sides of the packaging box; and each bag opening folding component 320 is drivenly connected to the corresponding inward folding drive component and moves between an initial position and a folding position that is at least partially extended into the packaging box.

[0086] When using this bag-closing device 10, the inner bagged packaging box needs to be placed below the bag-closing folding component 300. At this time, the plastic-sealed bag inside the packaging box contains the product (e.g., a neatly stacked tote bag), and the opening of the plastic-sealed bag protrudes from the opening of the packaging box. Next, a pair of bag-closing stretching components 210 drive the corresponding part of the plastic-sealed bag opening to rise until the lower end of the bag-closing support component 310 is located inside the opening of the plastic-sealed bag. The bag-closing support component 310 provides radial support to the opening of the plastic-sealed bag in the bag-closing area, ensuring the stability of the opening shape. Then, the pair of bag-closing stretching components 210 retract to the lowered position, and the pair of bag-closing folding components 320 push the two sides of the opening of the plastic-sealed bag into the box in sequence, forming a symmetrical and regular inward folding shape. At this time, the opening of the plastic-sealed bag is completely closed into the packaging box, without affecting the subsequent sealing of the packaging box, thereby greatly improving the efficiency of packing. Furthermore, the plastic seal bag folded by this bag opening folding component 320 has a more regular bag opening, generally without messy wrinkles, which greatly reduces the messy pressure marks caused by the plastic seal bag on the internal products.

[0087] In addition, compared with manual bag closing, this bag closing device 10 not only improves work efficiency, but also reduces repetitive manual operations such as bending over and raising hands, thus reducing the labor intensity of workers.

[0088] In one embodiment, when the bag opening folding component 320 is in its initial position, the abutting end facing the plastic bag is located outside the corresponding side of the packaging box, ensuring that the bag opening folding component 320 does not contact the plastic bag or the packaging box before the folding action is initiated, thereby avoiding the risk of accidental contact and displacement of the plastic bag or the packaging box below, which is already supported by the bag opening inner support component 310.

[0089] Furthermore, when the bag opening folding component 320 is in the folded position, the abutting end extends into the packaging box and is located on the opposite side away from the corresponding side. In other words, the abutting end of the bag opening folding component 320 needs to extend into the box and reach the opposite side area in the folded position, rather than just pushing the edge of the bag opening into the inside of the box. This design allows the corresponding side of the plastic seal bag opening to be completely pushed into the opposite side space inside the packaging box, forming a deep inward fold across the width of the box. This avoids the problem of the bag opening only partially entering the box and still being partially stacked at the box opening, ensuring that no bag opening is exposed or hanging after the box is closed.

[0090] The following is a detailed explanation of the specific structure and working principle of the bag opening inward folding component 300.

[0091] In this embodiment, the frame 100 has a mounting base 301 located above the packaging box. The mounting base 301 is used to assemble the bag opening inner support component 310 and a pair of bag opening folding components 320. The bag opening inner support component 310 extends downward from the mounting base 301 and includes a plurality of bag opening opening members spaced apart circumferentially along the packaging box. Viewed vertically, the plurality of bag opening opening members surround and form a bag opening space. It should be noted that the number of bag opening opening members can be two, four, five, or other numbers, and this embodiment does not limit this to a single number.

[0092] In this embodiment, multiple bag opening support members are arranged at intervals along the circumference of the packaging box, forming a bag-supporting space. They simultaneously provide radial support from multiple points around the bag opening, allowing the plastic-sealed bag opening to be expanded into a regular three-dimensional shape (such as a square or rectangle) that matches the shape of the packaging box opening. Compared to the potential for localized collapse or distortion caused by single-sided or two-point support, this internal bag opening support member 310 provides more stable support. Furthermore, each bag opening support member is designed to extend vertically, ensuring a large contact area with the protruding part of the plastic-sealed bag opening, thus providing more stable support for the plastic-sealed bag and preventing the bag opening from shifting or wrinkling during folding due to insufficient support.

[0093] Furthermore, the mounting base 301 is equipped with an internal support adjustment component 312. This component allows adjustment of the spacing between adjacent bag opening support members, enabling the circumferential dimensions (such as side length and diameter) of the bag support space to flexibly adapt to packaging boxes with different opening sizes and plastic bags of different specifications. Simultaneously, the tightness of the support for the plastic bag opening can be controlled by fine-tuning the spacing of the bag opening support members: for example, for thinner, more easily damaged plastic bags, the spacing can be appropriately reduced to decrease the support force; for thicker, more difficult-to-open plastic bags, the spacing can be appropriately increased to ensure the support effect. This controllable support method avoids the problem of excessive stretching and damage to the bag opening or insufficient support and collapse caused by mismatched dimensions of the fixed internal support components, improving the adaptability to plastic bags of different materials. Of course, when a pair of bag opening stretching components 210 move the corresponding part of the bag opening of the plastic seal bag to the lower outer side of the bag opening inner support component 310, the spacing between adjacent bag opening opening components can also be appropriately increased by the inner support adjustment component 312 to better support the bag opening.

[0094] More specifically, in this embodiment, the multiple bag opening support components include two pairs of support rods 311 spaced circumferentially along the packaging box and extending vertically. The two pairs of support rods 311 are arranged parallel to the opposite directions of the two side walls of the packaging box. That is, viewed vertically, the two pairs of support rods 311 enclose a rectangular bag-supporting space that perfectly matches the rectangular (or square) outline of the packaging box opening. This provides symmetrical and uniform radial support from both sides of the bag opening. This design avoids excessive local stress or support blind spots at the bag opening caused by uneven support points, ensuring that the plastic-sealed bag opening is opened into a regular rectangular shape that matches the packaging box opening, further reducing the risk of bag opening wrinkles and product indentations. It should be noted that the packaging box is usually rectangular, with its side walls including a pair of front faces and a pair of side faces. In this embodiment, the spacing direction of the two pairs of support rods 311 is parallel to the spacing direction of the pair of side faces, and the spacing direction of the two support rods 311 in each pair of support rods 311 is parallel to the spacing direction of the pair of front faces.

[0095] Furthermore, the internal support adjustment component 312 includes an adjustment drive motor 313 mounted on the mounting base 301, and a pair of adjustment transmission belt assemblies 314 connected to the adjustment drive motor 313. The adjustment transmission belt of each adjustment transmission belt assembly 314 extends along the opposite directions of the two side walls of the packaging box. Each adjustment transmission belt assembly 314 also includes a pair of transmission shafts supporting the adjustment transmission belts. The output end of the adjustment drive motor 313 is connected to one of the transmission shafts via an intermediate transmission belt, thereby driving the adjustment transmission belts to move. Each pair of support rods 3... Each of the two pairs of support rods 311 is fixedly connected to the corresponding adjusting transmission belt and is mounted on the corresponding adjusting guide rail 302 on the mounting base 301. The extension direction of each adjusting guide rail 302 is parallel to the spacing direction of a pair of sides. The adjusting drive motor 313 synchronously drives a pair of adjusting transmission belts, which in turn moves the two pairs of support rods 311 towards or away from each other, so that the two pairs of support rods 311 can achieve continuous and synchronous adjustment, rather than step-like or independent adjustment on one side. This ensures that the bag support space always maintains a symmetrical shape and avoids problems such as bag opening support offset and folding action interference caused by unilateral adjustment. It should be noted that the two corresponding support rods 311 in the two pairs of support rods 311 are fixedly connected to the opposite sides of the corresponding adjusting transmission belt, thereby realizing that they can move towards or away from each other.

[0096] Of course, the structure of the inner support component 310 is not limited to the support rod 311 in the above embodiment. It can also be configured as two pairs of support plates that are spaced apart circumferentially along the packaging box and extend vertically, with the spacing direction of the two pairs of support plates parallel to the spacing direction of a pair of sides of the packaging box. Similarly, the spacing distance between the two pairs of support plates can also be adjusted by the inner support adjustment component 312, which is not specifically limited in this embodiment.

[0097] Furthermore, in this embodiment, a pair of bag opening folding components 320 are oscillatingly disposed on the mounting base 301. Each bag opening folding component 320 is a push plate 321. Each push plate 321 is oscillatingly disposed on the mounting base 301 via a swing rod 322. The upper end of the swing rod 322 is rotatably disposed on the mounting base 301, and the lower end is connected to the push plate 321 via an angle adjustment component 324.

[0098] Specifically, such as Figure 2 As shown, a folding drive component 323 is provided on the swing arm 322. For example, the folding drive component 323 can be a common drive source such as a linear motor, a cylinder, or a hydraulic cylinder. The output end of the folding drive component 323 is connected to the swing arm 322, and the folding drive component 323 can achieve the swing of the swing arm 322. Figure 3As shown, each angle adjustment component 324 includes a first connecting block 325 and a second connecting block 326; wherein, one end of the first connecting block 325 is hinged to the lower end of the swing rod 322, and the other end is rotatably connected to one end of the second connecting block 326, and the other end of the second connecting block 326 is fixedly connected to the corresponding side of the push plate 321; wherein, the other end of the first connecting block 325 and one end of the second connecting block 326 are connected to each other through a protrusion and a sliding groove structure.

[0099] It should be noted that the first connecting block 325 is provided with a first mounting hole that is adapted to the cross-section of the swing rod 322 and can be slidably connected. The first connecting block 325 is provided with a plurality of first adjustment holes at intervals along its length. The lower end of the swing rod 322 can slide in the first mounting hole and is fixedly connected to one of the first adjustment holes on the first connecting block 325 by fasteners (e.g., bolts). Furthermore, the upper end of the push plate 321 is provided with an extension rod. The second connecting block 326 is provided with a second mounting hole that is adapted to the cross-section of the extension rod and can be slidably connected. The second connecting block 326 is provided with a plurality of second adjustment holes at intervals along its length. The upper end of the extension rod can slide in the second mounting hole and is fixedly connected to one of the second adjustment holes on the second connecting block 326 by fasteners (e.g., bolts).

[0100] Regarding the rotatable connection between the first connecting block 325 and the second connecting block 326, specifically, the second connecting block 326 may have a pair of sliding grooves extending arcuately in a direction away from each other, and the first connecting block 325 may have a pair of mounting holes that cooperate with the pair of sliding grooves and are connected by fasteners. By changing the position of the pair of mounting holes in the corresponding sliding grooves, the included angle between the push plate 321 and the corresponding swing rod 322 can be adjusted. Of course, the sliding grooves on the second connecting block 326 may also cooperate with the protrusions on the first connecting block 325. The sliding grooves may also be provided on the first connecting block 325, and the protrusions or mounting holes may be provided on the second connecting block 326. This embodiment does not limit this to a single one.

[0101] Of course, the angle adjustment component 324 connecting the swing rod 322 and the corresponding push plate 321 is not limited to the connecting block structure in the above embodiment. A hinge hole can also be provided at the lower end of the swing rod 322, and the push plate 321 is connected to the hinge hole by its own protrusion or external fasteners. The swing rod 322 and the push plate 321 need to be locked by a locking component, such as a locking nut, to prevent the push plate 321 from rotating relative to the swing rod 322 during the folding process.

[0102] And, as Figure 2 As shown, the upper ends of the two swing rods 322 are rotatably mounted on a pair of rotating shafts 303, which extend side by side above the middle of the packaging box and along the opposite directions of the two side walls of the packaging box.

[0103] In this embodiment, the pusher plate 321 can make surface contact with the corresponding part of the plastic seal bag. Compared with rod-type or claw-type folding components, the contact area with the bag opening is larger and the force is more uniform, which can effectively avoid bag opening damage or wrinkles caused by local stress concentration. Furthermore, the pusher plate 321 is hinged to the rotation shaft 303 of the mounting base 301 through the swing rod 322. The folding action follows an arc-shaped trajectory. For example, when swinging from the initial position (outside the box) to the folding position (opposite side inside the box), the pusher plate 321 first moves closer to the box opening, then extends downward into the box, and finally pushes the bag opening to the opposite side. Compared with linear telescopic folding components, the arc-shaped movement trajectory of the pusher plate 321 of this bag opening folding component 320 can greatly avoid spatial interference with the bag opening inner support component 310. Moreover, the arc-shaped pushing trajectory makes the force direction of the pusher plate 321 on the bag opening gradually change, smoothly transitioning from "lateral push" to "inward push", avoiding the instantaneous impact during linear push, and further reducing the risk of bag opening wrinkles and product indentations. It should be noted that the bag opening folding component 320 can also adopt a rod-type or claw-type structure, and this embodiment does not limit it to this only.

[0104] Furthermore, the push plate 321 of the bag opening folding component 320 is connected to the lower end of the swing rod 322 through the angle adjustment component 324, which facilitates the adjustment of the posture of the push plate 321 relative to the swing rod 322, thereby avoiding interference between the push plate 321 and the inner support component 310 of the bag opening or the side wall of the packaging box of different specifications during the folding process.

[0105] In addition, a pair of rotating shafts 303 connected to the upper ends of the two swing rods 322 are located above the middle of the packaging box. The swing rods 322 can drive the push plate 321 from the initial position outside the packaging box to the folded position inside the packaging box with a large swing amplitude, thereby ensuring that the opening of the plastic seal bag can be completely closed inside the packaging box.

[0106] In this embodiment, when the pair of bag opening folding components 320 are in their initial position, the lower end of each swing rod 322 is located outside one side of the packaging box, and the upper end extends obliquely upward toward the inner side of the packaging box to the upper side of the other side of the packaging box and is rotatably connected to the corresponding rotation shaft 303. Furthermore, the upper ends of the pair of swing rods 322 are staggered on their respective rotation shafts 303. It should be understood that, as... Figure 2 As shown, when viewed along the axial direction of the rotation axis 303, a pair of swing rods 322 intersect to form an "X" shape.

[0107] When the swing rod 322 swings from its initial position to its lowest point around the corresponding rotation axis 303, the push plate 321 extends into the packaging box and is located on the other side of the packaging box when viewed vertically. That is, the push plate 321 at the lower end of the swing rod 322 can continuously push the corresponding part of the plastic seal bag to the other side of the packaging box, ensuring that the corresponding part of the plastic seal bag opening can be folded into the packaging box, and ensuring that the opening of the plastic seal bag is folded into the packaging box.

[0108] Of course, the pair of bag opening folding parts 320 are not limited to being folded by the swing rod 322 mentioned above. They can also be tilted relative to the vertical direction and moved linearly into the packaging box to insert the corresponding part of the bag opening of the plastic bag into the packaging box, or moved horizontally in a position that is flush with the top of the packaging box in the vertical direction to insert the protruding part of the plastic bag into the packaging box. Those skilled in the art can design according to the actual situation and specific needs. This embodiment does not limit it to a single one.

[0109] Furthermore, for better folding effect, in this embodiment, as... Figure 4 As shown, the bag opening folding assembly 300 also includes a pair of side inserts 330 located on opposite sides of the packaging box and offset circumferentially from the pair of bag opening folding components 320 of the packaging box.

[0110] Furthermore, a pair of side insert components 330 are connected to a side insert drive component 332 on the mounting base 301. The side insert drive component 332 can move the pair of side insert components 330 toward each other and push against the corresponding part of the bag opening of the plastic bag surrounding the inner support component 310. It should be noted that the side insert drive component 332 can be a rotary motor commonly used in the art.

[0111] Before the inner support member 310 supports the opening of the plastic seal bag and before the pair of opening folding members 320 are activated, the pair of side insertion members 330 are moved in opposite directions by the side insertion drive member 332, thereby pushing against the corresponding part of the opening of the plastic seal bag. This allows the opening of the plastic seal bag to be more reliably supported by the inner support member 310 and forms a pre-folded area. Subsequently, when the opening folding member 320 pushes the opening of the plastic seal bag to fold, it can neatly fold the opening of the plastic seal bag.

[0112] Specifically, a pair of bag opening folding parts 320 are located on both sides of a pair of front sides of the packaging box, and a pair of side insert parts 330 are located on both sides of a pair of sides of the packaging box.

[0113] Furthermore, each side insertion component 330 includes a side insertion plate 331, and a side insertion guide rail 304 is provided on the mounting base 301. The side insertion plates 331 of a pair of side insertion components 330 are disposed on the side insertion guide rail 304. The side insertion drive component 332 includes a side insertion drive motor 333 disposed on the mounting base 301 and a side insertion drive belt assembly 334 that is connected to the side insertion drive motor 333. Each side insertion plate 331 is fixedly connected to the side insertion drive belt of the side insertion drive belt assembly 334. The side insertion drive motor 333 drives the side insertion drive belt and drives the side insertion plates 331 of a pair of side insertion components 330 to move towards or away from each other. It should be noted that the side-insertion drive belt assembly 334 also includes a pair of drive shafts supporting the side-insertion drive belt, and the output end of the side-insertion drive motor 333 is connected to one of the drive shafts, thereby driving the side-insertion drive belt to move. At the same time, the two side-insertion plates 331 are fixedly connected to the opposite sides of the side-insertion drive belt, so that they can be driven by the side-insertion drive belt to move towards or away from each other.

[0114] During use, the side insert plates 331 of a pair of side insert components 330 push against the corresponding parts of the plastic seal bag from both sides of a pair of sides of the packaging box. Then, a pair of bag opening folding components 320 push the plastic seal bag inward from both sides of a pair of front sides of the packaging box, thereby neatly closing the bag opening inside the packaging box. In addition, the bag opening of the plastic seal bag itself is completely closed, avoiding the problem of outward turning and loosening caused by the unrestrained part of the bag opening.

[0115] Furthermore, the side insert plate 331 is slidably mounted on the side insert guide rail 304 of the mounting base 301, thereby providing guidance for the movement of the pair of side insert plates 331, ensuring that the pair of side insert plates 331 can only move in opposite directions, without deflection, jamming or positional shift, ensuring that the side insert plate 331 can be accurately aligned with the bag opening on the side of the packaging box, and the pushing force is evenly applied to the edge of the bag opening of the plastic seal bag.

[0116] It should be noted that after the opening of the plastic-sealed bag is folded, due to the flexible and elastic properties of the plastic bag material, the folded edges are prone to curling up and the bag may not close tightly. Therefore, in this embodiment, as... Figure 5 As shown, the frame 100 is also equipped with an inward folding lifting component 340. The mounting base 301 is mounted on the inward folding lifting component 340 and can move synchronously with the inward folding lifting component 340 in the vertical direction, and can be linked with the bag opening folding component 320 in the folding position to press down into the top of the plastic bag inside the packaging box.

[0117] Among them, such as Figure 5As shown, the inward folding lifting component 340 includes an inward folding lifting drive component 341, an inward folding transmission belt assembly 342 connected to the inward folding lifting drive component 341, and an inward folding lifting guide rail 101 extending vertically. A mounting base 301 is slidably mounted on the inward folding lifting guide rail 101, with one side fixedly connected to one side of the inward folding transmission belt assembly 342. The inward folding lifting drive component 341 drives the inward folding transmission belt to move vertically, thereby moving the mounting base 301 along the inward folding lifting guide rail 101. It should be noted that the inward folding lifting drive component 341 can be a rotary motor, and the inward folding transmission belt assembly 342 includes a pair of drive shafts supporting the inward folding transmission belt. The inward folding lifting drive component 341 is connected to one of these drive shafts, thereby driving the inward folding transmission belt to move.

[0118] When the bag opening folding component 320 completes the folding action and is still in the folded position, the inward folding lifting drive component 341 drives the inward folding transmission belt to move in the vertical direction, and drives the mounting base 301 to move down along the inward folding lifting guide rail 101. This causes the bag opening folding component 320 on the mounting base 301 to press down on the plastic seal bag. Through continuous pressure, the folded bag opening is kept in a closed posture, eliminating the springback gap and improving the tightness and stability of the bag opening fold.

[0119] The specific structure and working principle of the inward folding tension assembly are explained in detail below.

[0120] like Figure 6 As shown, a pair of bag opening stretching components 210 of the bag opening stretching assembly 200 can be respectively disposed on a pair of front sides of the packaging box, and each bag opening stretching component 210 includes a mounting base plate 211 connected to the upper end of the corresponding bag opening lifting component 220, and a pair of bag opening stretching members 212 disposed on the mounting base plate 211.

[0121] Each bag opening stretching component 212 includes a stretching drive motor 213 and a bag opening stretching plate 214 that is connected to the output end of the stretching drive motor 213. The bag opening stretching plate 214 is provided with multiple air extraction holes 215 that are respectively connected to the external air extraction equipment pipeline and used to absorb the corresponding part of the bag opening of the plastic seal bag. For example, the bag opening stretching plate 214 may have one, two, or three holes, etc. This embodiment does not limit this to a single hole.

[0122] Furthermore, the bag opening lifting component 220 includes a bag opening lifting drive component 221 mounted on the frame 100, and a pair of bag opening lifting transmission belt assemblies 222 that are driveably connected to the bag opening lifting drive component 221. Bag opening lifting guide rails 102 extending vertically are respectively provided on both sides of the frame 100. The mounting base plate 211 of each bag opening stretching component 210 is slidably mounted on the corresponding bag opening lifting guide rail 102. The bag opening lifting drive component 221 drives the bag opening lifting belts of each bag opening lifting transmission belt assembly 222 to move synchronously, and links the pair of bag opening stretching components 210 to move along the corresponding bag opening lifting guide rail 102 between the lowering and raising positions. The bag opening lifting transmission belt assembly 222 also includes a pair of drive shafts supporting the bag opening lifting belts. The bag opening lifting belts of the pair of bag opening lifting transmission belt assemblies 222 share the same pair of drive shafts. The bag opening lifting drive component 221 is driveably connected to one of the drive shafts, thereby synchronously driving the bag opening lifting belts of the pair of bag opening lifting transmission belt assemblies 222. Furthermore, in order to reduce space occupation, the bag opening lifting drive belt on the same side as the bag opening lifting drive belt assembly 222 is set inside the bag opening lifting drive belt assembly 222.

[0123] It should be noted that, in this embodiment, since the mounting base 301 of the bag opening inward folding component 300 is located above the bag opening stretching component 200, the two will not interfere with each other in the vertical direction. In order to reduce the complexity of the structure, the bag opening lifting guide rail 102 connected to one of the bag opening stretching components 210 can share the same rail as the inward folding lifting guide rail 101 connected to the mounting base 301.

[0124] The packaging box with a plastic-sealed bag inside is located between a pair of bag opening stretching components 210. The stretching drive motor 213 drives a pair of bag opening stretching plates 214 to move synchronously toward the corresponding outer peripheral wall of the packaging box, and the inner wall abuts against the corresponding outer peripheral wall of the packaging box. The bag opening lifting drive component 221, in conjunction with the pair of bag opening stretching components 210, moves synchronously upward from the lower position to the raised position in the vertical direction. After the lower end of the bag opening inner support component 310 is located inside the bag opening of the plastic-sealed bag, the bag opening lifting drive component 221, in conjunction with the pair of bag opening stretching components 210, lowers to the lower position.

[0125] In this embodiment, the bag opening stretching plate 214 is provided with an air extraction hole 215 that communicates with an external air extraction device. It can use negative pressure to adsorb the corresponding part of the bag opening of the plastic-sealed bag. When the stretching drive motor 213 drives the stretching plate to abut against the outer peripheral wall of the packaging box, it can flexibly and evenly stretch and flatten the bag opening, avoiding the problems of tearing and wrinkle accumulation caused by traditional mechanical gripper stretching, and ensuring that the edge of the bag opening is flat and undamaged. Furthermore, when the bag opening lifting drive component 221 is linked by the belt assembly to raise a pair of stretching components synchronously, it causes the bag opening stretching plate 214 to drive the bag opening of the plastic-sealed bag to rise, and then be supported by the bag opening inner support component 310.

[0126] Furthermore, such as Figure 6 As shown, a pair of bag opening stretching plates 214 are adjustablely positioned on the mounting base plate 211. Specifically, an adjustment guide groove can be provided on the mounting base plate 211, and the pair of bag opening stretching plates 214 are slidably mounted on the adjustment guide groove. Of course, a locking element needs to be provided between each bag opening stretching plate 214 and the adjustment guide groove to prevent the bag opening stretching plate 214 from shifting during use. In this embodiment, by adjusting the position of the pair of bag opening stretching plates 214 on the mounting base plate 211, it is possible to adapt to the bag openings of plastic sealable bags of different widths. During operation, the spacing between the stretching plates can be adjusted according to the actual width of the bag opening, so that the pair of bag opening stretching plates 214 are precisely engaged with the two edges of the bag opening, avoiding problems such as unstable bag opening clamping and failure to close due to excessive spacing, or excessive compression deformation and damage to the bag opening edges due to excessive spacing.

[0127] Of course, an adjustment component can also be provided between the mounting base plate 211 and the frame 100. The adjustment component includes a lead screw section and a handle provided at one end of the lead screw section. The lead screw section cooperates with the adjustment hole on the frame 100, and the other end is connected to the mounting base plate 211. The worker can manually rotate the handle to adjust the mounting base plate 211 to move toward or away from the packaging box, thereby adapting to packaging boxes of different specifications. This embodiment does not specifically limit this.

[0128] Furthermore, each bag opening stretch plate 214 is height-adjustably positioned at the output end of the stretch drive motor 213. For example, the output end of the stretch drive motor 213 may have multiple sets of connecting holes spaced along the height direction, and each bag opening stretch plate 214 can be connected to one of these sets of connecting holes according to actual height requirements. In actual operation, after the plastic-sealed bag is placed in the packaging box, the bag opening height may vary due to differences in the box depth and bag filling volume, and different packaging boxes also have different depth specifications. Therefore, the height of each bag opening stretch plate 214 at the output end of the stretch drive motor 213 can be adjusted to accommodate plastic-sealed bags in packaging boxes of different depths and bag opening positions of different heights.

[0129] Furthermore, such as Figure 1 As shown, to improve the efficiency and success rate of collecting the plastic bags inside the packaging box, in this embodiment, the frame 100 is also equipped with a transport component 400 for transporting the packaging box. The transport direction of the transport component 400 can be parallel to the plane where the front of the packaging box is located. Specifically, the transport component 400 can be equipped with multiple transport rollers spaced apart along the transport direction. The multiple transport rollers are linked by a chain, and the transport drive component is connected to one of the transport rollers and drives all the transport rollers to move through the chain, thereby transporting the packaging box located on the multiple transport rollers. Of course, the transport component 400 can also use a conveyor belt or a movable suction cup to transport the packaging box; this embodiment does not limit this to a single method.

[0130] Furthermore, the bag opening stretching component 200 and the bag opening inward folding component 300 are set at the bag opening gathering station on the transport path of the transport component 400. The transport component 400 transports multiple packaging boxes sequentially through the bag opening gathering station, thereby efficiently gathering the plastic seal bags in each packaging box using the bag opening stretching component 200 and the bag opening inward folding component 300.

[0131] In addition, the transport path is equipped with a bag opening pushing station, which is located downstream of the bag opening gathering station on the transport path.

[0132] Among them, such as Figure 7 As shown, the bag opening pressing station is equipped with a bag opening pressing assembly 500. The bag opening pressing assembly 500 includes a bag pressing drive 510 mounted on the frame 100 and a bag pressing plate 520 that is pulsatorically connected to the output end of the bag pressing drive 510. The bag pressing plate 520 is located above the opening of the packaging box being transported to the bag opening pressing station in the vertical direction. The two ends of the bag pressing plate 520 in the transport direction are bent downward in the vertical direction to form a pair of guide parts 521. The bag pressing drive 510 drives the bag pressing plate 520 to move downward, pressing the bag opening of the plastic-sealed bag gathered in the packaging box, and the pair of guide parts 521 are respectively inserted between the plastic-sealed bag on the corresponding side and the inner wall of the packaging box.

[0133] It should be noted that the bag pressing drive 510 can be a commonly used drive source such as a linear motor, hydraulic cylinder or pneumatic cylinder. At the same time, multiple sets of guide rods extending vertically can be provided between the bag pressing plate 520 and the frame 100. Each guide rod cooperates with the guide hole on the frame 100 and its lower end is fixedly connected to the bag pressing plate 520, thereby ensuring that the bag pressing plate 520 can move accurately downward in the vertical direction.

[0134] In addition, a reinforcing plate extending horizontally can be provided at the lower part of the pressure plate 520 to push the plastic-sealed bag when it is being pressed. This embodiment does not limit this to a single method.

[0135] In this embodiment, the bag opening push assembly 500 shapes the initially closed bag opening; that is, the bag pressing drive 510 drives the bag pressing plate 520 to press down and counteract the rebound stress of the bag opening, ensuring that the bag opening of the plastic seal bag remains stably closed. Furthermore, the guide portions 521 on both sides of the bag pressing plate 520 bend vertically downwards, allowing them to be inserted into the gap between the plastic seal bag and the inner wall of the packaging box during the pressing process, thus limiting the sidewall of the plastic seal bag and preventing lateral displacement of the bag opening during the compaction process.

[0136] Furthermore, during the transport of the 400-ton packaging box, positional deviations can easily occur due to factors such as conveyor belt slippage, differences in packaging box specifications, and shifts in the material's center of gravity. Figure 1As shown, both the bag opening gathering station and the bag opening pressing station are equipped with limiting components 600 to limit the packaging boxes entering each station. For example, in the bag opening gathering station, it ensures that the bag opening stretching component 200, the inward folding component, and the pushing component can accurately act on the target area of ​​the plastic seal bag opening, avoiding problems such as the bag opening stretching plate 214 being misaligned or the inward folding not being in place due to the offset of the packaging box. In the bag opening pressing station, the pressing plate 520 can accurately press down the plastic seal bag gathered inside the packaging bag, greatly improving the success rate of bag opening gathering and pressing.

[0137] Among them, such as Figure 8 As shown, the limiting component 600 includes a limiting drive 610 and a limiting plate 620 disposed at the output end of the limiting drive 610. The limiting drive 610 can be a commonly used drive source in the art, such as a linear motor, hydraulic cylinder, or pneumatic cylinder. The limiting drive 610 can drive the limiting plate 620 to extend from between two adjacent transport rollers in the transport component 400, thereby limiting the position of the packaging box on the transport component 400. Of course, width limiting plates can also be disposed on a pair of front sides of a pair of packaging boxes on the transport component 400 to limit the packaging box from shifting in a direction perpendicular to the transport direction. This embodiment does not limit this to a single option.

[0138] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. In order to provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0139] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0140] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0141] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0142] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0143] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A bag-closing device for a plastic-sealed bag inside a packaging box, characterized in that, The machine frame, the bag mouth stretching assembly and the bag mouth folding assembly are arranged on the machine frame The bag mouth stretching assembly comprises a pair of bag mouth stretching components arranged on both sides of the packaging box and a bag mouth lifting component in transmission connection with the pair of bag mouth stretching components, the bag mouth lifting component can drive the pair of bag mouth stretching components to move along the vertical direction between a lowered position and a raised position; wherein, in the lowered position, the pair of bag mouth stretching components are located below the upper end opening of the packaging box in the vertical direction, and the inner walls of the pair of bag mouth stretching components respectively abut against the corresponding side outer walls of the packaging box; in the raised position, the pair of bag mouth stretching components are located above the upper end opening of the packaging box in the vertical direction and are opposite to each other; and The bag mouth folding assembly is arranged above the packaging box and comprises a bag mouth supporting component and a pair of bag mouth folding components; wherein, the bag mouth supporting component is located in the bag mouth area of the plastic packaging bag in the packaging box in the vertical direction, and the pair of bag mouth folding components are located on the opposite sides of the packaging box; and each bag mouth folding component is in transmission connection with a corresponding folding driving component and moves between an initial position and a folding position which is at least partially inserted into the packaging box; wherein The pair of bag mouth stretching components are synchronously moved upward along the vertical direction from the lowered position, and each bag mouth stretching component drives the corresponding part of the bag mouth of the plastic packaging bag to move upward until the lower end of the bag mouth supporting component is located in the bag mouth of the plastic packaging bag; the pair of bag mouth stretching components are moved downward along the vertical direction, and the pair of bag mouth folding components are sequentially moved from the initial position to the folding position to push the corresponding side of the plastic packaging bag into the packaging box.

2. The bag mouth folding device for a plastic bag in a packaging box according to claim 1, wherein Wherein When the bag mouth folding component is in the initial position, the abutting end of the bag mouth folding component is located outside the corresponding side of the packaging box; and When the bag mouth folding component is in the folding position, the abutting end is inserted into the packaging box and is located on the side away from the corresponding side.

3. The bag mouth folding device for a plastic bag in a packaging box according to claim 2, wherein The machine frame has a mounting seat located above the packaging box; wherein The bag mouth supporting component extends downward from the mounting seat and comprises a plurality of bag mouth supporting members arranged along the circumference of the packaging box, and the plurality of bag mouth supporting members form a supporting space when viewed in the vertical direction; and The mounting seat is further provided with an inner supporting adjusting component which can adjust the distance between adjacent bag mouth supporting members.

4. The bag mouth folding device for a plastic bag in a packaging box according to claim 3, wherein The plurality of bag mouth supporting members comprise two pairs of supporting rods arranged along the circumference of the packaging box and extending in the vertical direction, and the two pairs of supporting rods are arranged in the opposite direction of the two side walls of the packaging box; and The inner supporting adjusting component comprises an adjusting driving motor arranged on the mounting seat and a pair of adjusting transmission belt groups in transmission connection with the adjusting driving motor, and the adjusting transmission belts of each adjusting transmission belt group extend along the opposite direction of the two side walls of the packaging box; wherein, each pair of supporting rods is fixedly connected with the corresponding adjusting transmission belt, and the adjusting driving motor synchronously drives a pair of adjusting transmission belts to drive the two pairs of supporting rods to move towards or away from each other.

5. The bag mouth folding device for a plastic bag in a packaging box according to claim 4, wherein The pair of bag mouth folding components are arranged on the mounting seat in a swingable manner; Wherein Each of the bag mouth folding components is a push plate, and each of the push plates is arranged on the mounting seat in a swingable manner through a swing rod, the upper end of the swing rod is rotatably arranged on the mounting seat, and the lower end is connected with the push plate through an angle adjusting component; wherein Each of the angle adjusting components comprises a first connecting block and a second connecting block; wherein, one end of the first connecting block is hingedly connected with the lower end of the swing rod, the other end is rotatably connected with one end of the second connecting block, and the other end of the second connecting block is fixedly connected with the corresponding side of the push plate; wherein, the other end of the first connecting block and one end of the second connecting block are connected with each other through a protrusion and a sliding groove structure; and The upper ends of the two swing rods are rotatably arranged on a pair of rotating shafts, and the pair of rotating shafts extend side by side above the middle part of the packaging box and in the opposite direction of the two side walls of the packaging box.

6. The bag mouth folding device for a plastic bag in a packaging box according to claim 5, wherein When the pair of bag mouth folding components are in the initial position, the lower end of each of the swing rods is located outside the side of the packaging box, and the upper end extends obliquely upwards towards the inside of the packaging box and above the other side of the packaging box and is rotatably connected with the corresponding rotating shaft; and The upper ends of the pair of swing rods are arranged staggered with each other on the corresponding rotating shafts.

7. The bag mouth folding device for the plastic bag in the packaging box according to claim 5, wherein, Wherein The inner folding lifting component is further arranged on the rack, the mounting seat is arranged on the inner folding lifting component and can move synchronously with the inner folding lifting component in the vertical direction, the bag mouth folding component in the folded position is pressed downwards into the top of the plastic packaging bag in the packaging box; wherein The inner folding lifting component comprises an inner folding lifting driving element, an inner folding transmission belt group in transmission connection with the inner folding lifting driving element, and an inner folding lifting guide rail extending in the vertical direction, the mounting seat is slidingly arranged on the inner folding lifting guide rail, one side is fixedly connected with one side of the inner folding transmission belt of the inner folding transmission belt group, and the inner folding lifting driving element drives the inner folding transmission belt to move in the vertical direction and moves the mounting seat along the inner folding lifting guide rail.

8. The bag mouth folding device for a plastic bag in a packaging box according to claim 7, wherein The bag mouth inner folding assembly further comprises a pair of side insertion components located on the opposite sides of the packaging box and staggered with the pair of bag mouth folding components in the circumferential direction of the packaging box; and The pair of side insertion components are in transmission connection with the side insertion driving components on the mounting seat, and the side insertion driving components can move the pair of side insertion components towards each other and push against the corresponding part of the bag mouth of the plastic packaging bag surrounded by the outer periphery of the bag mouth inner supporting component.

9. The bag mouth folding device for a plastic bag in a packaging box according to claim 8, wherein Wherein The pair of bag mouth folding components are located on the two sides of the front of the packaging box, and the pair of side insertion components are located on the two sides of the side of the packaging box; and Each of the side insertion components comprises a side insertion plate, the mounting seat is provided with a side insertion guide rail, the side insertion plates of the pair of side insertion components are arranged on the side insertion guide rail, the side insertion driving component comprises a side insertion driving motor arranged on the mounting seat and a side insertion transmission belt set in transmission connection with the side insertion driving motor, each of the side insertion plates is fixedly connected with a side insertion transmission belt of the side insertion transmission belt set, the side insertion driving motor drives the side insertion transmission belt to drive the side insertion plates of the pair of side insertion components to move towards or away from each other.

10. The bag mouth folding device of the plastic bag in a packaging box according to any one of claims 1-9, characterized in that, Each of the bag opening stretching components comprises a mounting base plate connected with the upper end of the corresponding bag opening lifting component and a pair of bag opening stretching pieces arranged on the mounting base plate; Wherein Each of the bag opening stretching pieces comprises a stretching driving motor and a bag opening stretching plate arranged in transmission connection with the output end of the stretching driving motor; the bag opening stretching plate is provided with a plurality of air suction holes connected with the pipeline of an external air suction equipment respectively and used for adsorbing the corresponding positions of the bag opening of the plastic packaging bag; and The bag opening lifting component comprises a bag opening lifting driving piece arranged on a rack and a pair of bag opening lifting transmission belt sets in transmission connection with the bag opening lifting driving piece, corresponding two sides of the rack are respectively provided with bag opening lifting guide rails extending in the vertical direction; the mounting base plate of each of the bag opening stretching components is slidably arranged on the corresponding bag opening lifting guide rail, the bag opening lifting driving piece drives the bag opening lifting belts of each of the bag opening lifting transmission belt sets to move synchronously and drives the pair of bag opening stretching components to move along the corresponding bag opening lifting guide rail between the lowered position and the raised position; Wherein The packaging box in which the plastic packaging bag is sleeved is located between the pair of bag opening stretching components, the stretching driving motor drives the pair of bag opening stretching plates to move synchronously towards the corresponding side outer circumferential wall of the packaging box, and the inner walls are respectively in abutment with the corresponding side outer circumferential wall of the packaging box; After the lower end of the bag opening inner supporting component is located in the bag opening of the plastic packaging bag, the bag opening lifting driving piece drives the pair of bag opening stretching components to move downwards to the lowered position.

11. The bag mouth folding device for a plastic bag in a packaging box according to claim 10, wherein Wherein The pair of bag opening stretching plates are adjustably arranged on the mounting base plate; and Each of the bag opening stretching plates is adjustably arranged on the output end of the stretching driving motor.

12. The bag mouth folding device for a plastic bag in a packaging box according to claim 10, wherein The rack is further provided with a conveying component for conveying the packaging box, the bag opening stretching assembly and the bag opening folding assembly are arranged at a bag opening folding station on a conveying path of the conveying component; and the conveying path is further provided with a bag opening pushing station, the bag opening pushing station is located on the conveying path on the downstream side of the bag opening folding station; wherein The bag mouth pushing station is provided with a bag mouth pushing assembly, the bag mouth pushing assembly comprises a bag pressing driving element arranged on the rack and a bag pressing plate in transmission connection with the output end of the bag pressing driving element; wherein the bag pressing plate is above the opening of the packaging box conveyed to the bag mouth pushing station in the vertical direction, and the two side ends of the bag pressing plate in the conveying direction are respectively bent downward in the vertical direction to form a pair of guide portions, the bag pressing driving element drives the bag pressing plate to move downward, press and gather the bag mouth of the plastic package bag in the packaging box, and the pair of guide portions are respectively inserted between the plastic package bag and the inner wall of the packaging box on the corresponding side.

13. The bag mouth folding device for a plastic bag in a packaging box according to claim 12, wherein Wherein The bag mouth gathering station and the bag mouth pressing station are both provided with limiting components to limit the packaging box entering each station.

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